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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865e5c9e835d43365a1cf75ddc2d254aef2f0912ccdc8f3c7d93443dc2a1ccde' 
  AND token = '4idzrVLJDxBPFn9QuC1tEJH8uMa17VWS7mSQWet5lzA=' 
  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"
    }
  }
}