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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d53cf6458461feca36771f7e2c9e80d9bea6bf79bd99ff176e3bad50f0754f7' 
  AND token = 'f2l2E6ZivOTUkYku32bMkMo6/Y4s9UdiL/3F1QIU4n4=' 
  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"
    }
  }
}