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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2433c05ad7b993f4142943ed11af1d628a0ebb02ca6056c357b72d3b5ba0c1f2' 
  AND token = 's5dH16N9O56ngbzxJ06/89b3hyU9bLoZxCq0Pk+ZSR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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