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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae1b3a26d8daa461398264c640fb136f0c1a0bef9f8c1ca00aac386bb343319' 
  AND token = 'taMuzfe7auuDTGSPvoqoQbulVF3e6j4g2qYg1mrjOd0=' 
  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"
    }
  }
}