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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4ad3d503b17e6f6af591976fa5b092535fc9b6212c5045b22d26fa3d95bc23' 
  AND token = 'k6+lUj9KIz9Xn3l1bTLuvyFdToNIUnfUXLLxqOe6uok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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