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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d37fc5058b1a481f55c4ccfe56f3b46aa1a0ed48dd30eb596917fbcebbff879' 
  AND token = 'ZS7llUp8R2wyvFLBrSst5RCXEpJxIDRF5N9oenBLa/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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