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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c9f2292d02fc8779e14d82ecb6969842d4462c5a74a792729d73922d9d8417' 
  AND token = 'xNfMGoVjrz1nSmmFuDC/SCoi7yTGvkkBMDm8zyOk+GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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