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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c90b3f84c65810935806ff19be1f99ca8571afcaf931a3b98161c2cb8c2662' 
  AND token = 'xAsgTlgC4qdnCGO7d9F2UoVHeH6X1kv1IsDSGv/s6RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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