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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32285be33f33c81e15481da652346c0123deb1d21674cc029b4f71b18a7c9339' 
  AND token = 'aje6QAZfjL9uzmNo/Q/znvO1m9l7kie+RfdG/3sRQpE=' 
  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"
    }
  }
}