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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2349c9cbd35b9ae539bab9c02b51ff037f980255ed82d290ccbea1750546fa0' 
  AND token = '4ejefemdDenUo/bUAIW/5pb+0Auh0YML7pKsd+R4rOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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