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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3dde033954d6e7beb620f563c1b38433b38b5c57f5b22e1b2e4196008e35a0' 
  AND token = 'Zs1P/ardhhAbdNTOiKD7/SLLLkEpRIJy1OfrfwtenNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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