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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c120a3c98640161f8983bc26bc4c7506ff82b744167a8437726b5731949cee4f' 
  AND token = 'wxr9SLep13QAm1aSqdRnP8ce2nArLFKKY02qJjDIERg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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