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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cde9ed53cdee454b09a04a53eb0d1a14bacfe69bbc17060ca156d5f399b6497' 
  AND token = 'Oj/Qjq1B0Ty9XtTbkssS+8o4y1vh75H8noegtWke4Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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