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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a13c45aaf3838312043185b64e92cd487b5158b6ef8e8374c2020d0f3cf5d94' 
  AND token = 'dWWrb1JPnNefd2m9ovPc9njOdQqewUHISY5n4Dlb8Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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