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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd873d570475c03516c4604c53013b92afe22e80edef2f4d19b68ea5e55ef9eb' 
  AND token = 'tiwRAznbi1G9FQNvJLINVxYFC1BrzODc89ONFqumWs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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