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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02abcd95157a0e68039c83a3c5e54db724253d651a54bdc846681c13fdfabc7b' 
  AND token = 'g8h+K5BktQCtUQvuKH0IasExLOahMC75T3hbOsN4g28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}