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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a0c17faca3411e9c6756c65ee6c2e7dfe55d941a879d5f85c301f19d63408c' 
  AND token = 'FaqGc3qkgaNdSvDUwKA/k/bAUMvKLI/Y9eNoU7VqvY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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