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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b351bbd4065176cd7be89f40da2bad29e4036df5266ea7fe90b88696d8647526' 
  AND token = 'IVAx0GLbRkwsxFR+by3Hu5jx7rpU8cQIslzfIlnuV08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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