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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75cd6ce651cebfbb03d06d0ae416101511d164b7845a70cc734328bc1ab5edc6' 
  AND token = 'VaeA2AETvOc/ysyUhv/o3OTxZo/2Ei4beTaFERPx2aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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