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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c546a5268c4e0584406d07be52ebac26681ac78d6a25117892b84a41f3e0c2b' 
  AND token = '7UAn+BhWqWNsrhZp+Wy8o5K2/CUPXOc4Kh94qZkil30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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