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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6d90eda387269473e236658e25e2347a33661f6f4e9ec9c819f865bbeff17c' 
  AND token = 'oUA60oSpnvO4qqMMe5jDwuCZqW+uNixtfW1Mj9HfIf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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