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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55624b1fdc1dc603cd3123a771b32a53519c11e1049f41327c1d0e38b3b2e01' 
  AND token = 'yVVPQ8EvRpwvTOFZaV1w67eaY8IgLBUKWsn6t4xtYZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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