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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e61aa86b173f230e4f24d0d708cc8375d3edbdd69952f71813ce6dc806039c' 
  AND token = 'gi8bHDq9MBY+7wnlfaxAO3vyNSPuiFpxe9ihgTqg1VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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