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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcfeee9534e84697626a825aa0df50c2eec238be028b4e459693dc3fd070813' 
  AND token = 'DDK7D0xwCTs5LYk6IoHGeilh2cvrk/2kvd4e5It+apw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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