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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59df0a43d076d360fc51a2e37af7b43f8d856fd5b912272501707e90c35fb49a' 
  AND token = 'X1y2Z7cov9FHqGvF5xCIR40LmMaVrduRKeTom6Dqk9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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