SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e62dcf8c4c943086176a824a502eb238d986f5a68d44fcbf88a7b22c8a62128' 
  AND token = 'V5TQWZ/gt0J+CPTXw/yHEeGl6l48m8hqtzGox/jvFfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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