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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80237feb1501253be01055dfe55d7de859af1b0737694fa4ab6e266e60cf373a' 
  AND token = 'ywjAvSshwRR7DD6LCyyL1WXsEn1bt50Np80vOv1S5ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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