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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dfada764c4855a84707b28c41476ae770d4ec08095b42dd3178e1eaddb31cc4' 
  AND token = 'PStat58IZsMLjwHI/ij0kWzG7s+1QPq0QstneVM+HIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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