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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fc498711f894a4a80c43611160a0f3fff211cea6177fe80ce50609db7a025d' 
  AND token = 'nW1bifmQWg8hdhniD29BuBWE4cmJpSP35R+zwmR4200=' 
  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"
    }
  }
}