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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c54047d5345d2f6a70dd5d44cc359e290e4d8afdc501bb7d043dfa3785aad62' 
  AND token = 'j5n0EgRoLYci45Ryy4u1I8EVqcRJLG0SO21X2rfiGAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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