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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02eacce5fc3d327aa7446312d8ad34b608228cdd40543fbc28cccc22d66fbb3f' 
  AND token = 's1Zt3RkkrJLC/bVzMbQSuO/2YOWjcW3DqokFWthvkV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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