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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df47158f8810892594c87169307035929b9ebfa2e769a4f4c281c01c7aa6c74' 
  AND token = '7gqvowu8i21+cEZZVk6d1sTHlvzzD0ZkMuXcLxWhYvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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