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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549ca05b02d2fa6bf2d4356861caba54a30589a9349b41d3f45fb3b537e6c3b5' 
  AND token = 'UES0yP5C4tBBUNoX9nt4RkyqInO2jlt0UbWo4JW7azc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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