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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75b5d4cb3c35d3e74c8a40b47a5a8e557113d6789b0dd6538d67a2b03b9fbc5' 
  AND token = 'tm7rh7265EbTBhMJTHPz54CQZQz4LXP4weMOZZHFOLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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