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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035562c84e938632f101d49bdcc12c80ea7cf0945e37c4f4826cd117f86539bd' 
  AND token = 'uOxO9usOFTGrwvnGyIv4LH3Nx7nklH6Q+U2RjjXEUcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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