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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571811ad363610192370740b8ad7e7c834744380a20886d43e4367b6bc3fa674' 
  AND token = 'G9QHqw7E2yYR4akSBBDvdI8wllygHvawM7iGiq+c3TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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