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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b386f2131cb7d823ff4bec68a6d94767112e1183d897fec9b212bde50d26fa' 
  AND token = '3wTGmoafnM0cXFsuxTo9CgCQD5U4hU3Atc4yp0Yf2ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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