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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4caa3821a6bfb43fa06a48b2133d5a315c102d802e61c773d2b1a74cf568eb' 
  AND token = '//1ybgmVnuE07M5ajEWgqaHCQSUjwxkPkFE5LJMbD7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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