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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4109b09e6d12954ed3831620daa4dca02e900b8c980cc1d826ee969bbb8138' 
  AND token = 'dJnIdh8mtiobUvZu/azO8owcliui4Gd+B71EQ4aK/LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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