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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3be42ec0be780211865dc89a415ab049d49770be3fb7ba72c7fa61ead47668' 
  AND token = 'zn4e1xfjGc2gidDAjxhm1RB7TsCQur5Lyjl5zdUnaWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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