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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6453ff2b4c7ee0f578d0cec532a818c9b4f25ed7e07a010137730f297c9830' 
  AND token = 'G4wHI0ty2nhDkFzGz6zQXYvOwr3dmzrd2SLKWcIqGgA=' 
  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"
    }
  }
}