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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a30ee687b531add3d670aa3f8aa2700f2e64b8b41ef67c22cc539d9fb456d3' 
  AND token = '/luZGna485bw87NllTNW1fkqB32NRVtV71FgAHZ5iw4=' 
  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"
    }
  }
}