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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095c93eb59036d4ec104cda1cd1e03cde7fccede372c8253ab03efb2b957d57d' 
  AND token = 'R3QRZfUjmxnHes4Ska2SVzl8SzC1nwZ8bETlovXELjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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