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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0c2049c96a6934c46277d609c289cbf1f20feab8d93e07887e6eeb95f68cf1' 
  AND token = '6GHnG77G3cLOiT8uKSJ30FRgHqq8hvBxzS9lbLpxgno=' 
  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"
    }
  }
}