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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b330a1d11b9561aca8e7e3e77ab61586837dc87a6ac6c7de61e9b0785466dc5' 
  AND token = 'arDZ6UcA+/y2l22Q2BB6O+9DG7UaPsR/Y8GiZftMCiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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