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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46a0ca7f6aecb78f9c07ca6324e241d9b3d0adbbccb9fec1cd095a4d1b50692' 
  AND token = 'B8W5Uobi5cayF6SPKYPzm4JKH8qUBcqJOlOfIq3ZYO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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