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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1538e95e4a9df0a0c97bed9627ceadfb109747802e9f8bf1ceab9a2c33250da0' 
  AND token = '32Fs8Sr8aXmmX9IR/98wGTmddsa308Q/6csVGb3KbMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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