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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c290e3d9c8f5be374bc5b087285d35d09dbfcf433000d629fcc7f8edde0b9dd7' 
  AND token = 'GhUmXwefBB0iUMaCOURFgQtnmtj8mJT39rHNWeVkXoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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