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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541b21912120b149fe662d6e4b2ff917c88bf5cb1a93a6e6f14030e693ca242e' 
  AND token = '8jEifEbs7mTUzBFPlm9ZePCfIKkAIbdhBSxBQw6aKU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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