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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca306b34649765c9000bd2b5f1d874b4abee2153ee689036d4a6beed20c6ec2d' 
  AND token = '3bexddUdGjqXh++w9yB7ZNoXX2rKztNsvIH9FCsZ95s=' 
  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"
    }
  }
}