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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aeb29dfadc2856229f8c9bb364ba24638011ecdbd999526dd76cff601108115' 
  AND token = '9pfpjRWzNI79v/5C95a1OdubeRQ7Q9DQ+IpVA02Ex08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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