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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2764026c59e5312e7c40a232d63e4aa7b590bfca0ec8761599c323c3a39ce8' 
  AND token = 'N7OOOZN97hWomZslscDjRNsmZ/TKf9Lr0W7ATMhJhB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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