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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62c7666f4ce8e05388b851c7f222988ceba9b2b97c7f6c1048fa2345bad223e' 
  AND token = 'kiH+Gm+DvU9XM3/5VRfwCv7G22CzzOLnSsbfHJpeV64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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