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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99c08869107e7b7b9616186724ca6908db6e1f529b8a79fbe3c178aa78d44e9' 
  AND token = 'xeWO/DviKGejcvx4l4DqD6G1q1XOVo4RNFmkba/gd4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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