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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c148aaa0ef9bb17c4aa4e967a4f5e7fa4d0614ca8706e6200e991a9c576d21' 
  AND token = 'aGnPUoRlLgMHR+HjqAa3Wrx1z8KI1sBL2pIqFJupn8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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