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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd816dfa905c16d9a3d7171e6481a20920526fb8ad802f5e22a59f469d99f9596' 
  AND token = 'BcAvBeU47uCEoB+6yGVDE/6t1b7Di8hsWcwUFez1prg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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