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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b3bbcb6d13144dc9d206f50521ab111914e6d36cd7a69c893a0c05c6fa32c9' 
  AND token = '8gyqBvQdaWyfbpOWF0g0lRZgiTsNtkmz0/6OICryW5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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