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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9ea09ca7dea52baa6d7de58221e1f68b8a64cab4b1ac62bd05d3e0c42ec7fb' 
  AND token = 'rfvagNF/ZKXgRFSLRXXuQxtROGLzj6IyJpUwgFgM1bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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